Ivoclar Vivadent PS Empress CAD Chairside - Manual (Page 25)

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Fabrication of IPS Empress
®
CAD Restorations
– V
eneers / Cr
owns – stained / glazed
If more intensive and excessive shade adjustments are desired, we recommend conducting them in several working steps.
To reproduce the tooth shade easily and reliably, an individual control die may be fabricated using the IPS Natural Die
Material. The IPS Empress Universal Shade and Stains are then applied in a first step and separately fired. The shade result
can be checked after firing. If required, the shade of the restoration may be intensified and adjusted to the individual
patient case by repeated application of the materials. Once the desired shade has been achieved and the individualized
characterizations completed, the glaze firing is conducted.
For information on the CAD/CAM processing, please refer to the respective Instructions for Use and the
manuals of the respective CAD/CAM system. The instructions of the manufacturer must be observed.
Finishing
For finishing and adjusting glass-ceramics, appropriate grinding instruments are indispensable. If the wrong grinding
instruments are used, marginal chipping and local overheating may occur.
The following procedure is recommended for finishing IPS Empress CAD restorations:
– Use only suitable, fine-grained (grain size < 60 µm), ceramic-bonded grinding instruments or diamonds at a speed of up
to 20,000 rpm and little pressure.
– Carefully finish the restoration margins using rubber and silicone polishers
(speed: < 10,000 rpm).
– Avoid overheating of the glass-ceramic.
– Smooth out the attachment point of the holder and take the proximal
contact points into account.
– Carry out individual shape adjustments, if required.
– Design the surface structure somewhat more pronounced, if necessary,
since it will be toned down by the glazing procedure.
Optional
Die fabrication with IPS Natural Die Material
The light-curing IPS Natural Die Material simulates the shade of the prepared tooth. Fabricate a control die of the selected
shade. This control die supports the optimum shade adaptation of the restoration to reproduce the given oral situation.
– Coat the inner surfaces of the ceramic restorations with IPS Natural Die Material Separator and allow it to react for a
short time.
– Apply the IPS Natural Die Material in the corresponding shade to the
restoration and/or inner aspects of the restoration using the
IPS Condenser and adapt it so that the entire inner aspect is coated
and filled.
– Completely fill the restoration cavity and insert an IPS Die Holder into
the material and adapt excess material around the holder. Make sure
that the Die Material is well adapted to the restoration margins and
that no gaps are present.
– Polymerize the IPS Natural Die Material die with a commercial poly-
merization light for 60 seconds.
– After polymerization, finish and smooth the die, if required.
The control die made of IPS Natural Die Material is the optimum basis
for a true-to-nature all-ceramic restoration.
Individual shape adjustments and a true-to-nature surface structure are
designed.
Empress
®
CAD
Veneers / Crowns – stained / glazed
IPS